The LTC4360 overvoltage protection controller safeguards 2.5V to 5.5V systems from power supply overvoltage. It is designed for portable devices with multiple power supply options including wall adaptors, car battery adaptors and USB ports.The LTC4360 controls an external N-channel MOSFET in series with the input power supply. During overvoltage transients, the LTC4360 turns off the MOSFET within 1μs, isolating downstream components from the input supply. Inductive cable transients are absorbed by the MOSFET and load capacitance. In most applications, the LTC4360 provides protection from transients up to 80V without requiring transient voltage suppressors or other external components.The LTC4360 has a delayed start-up and an adjustable dV/dt ramp-up for inrush current limiting. APWRGDpin provides power good monitoring for VIN. Following an overvoltage condition, the LTC4360 automatically restarts with a start-up delay. The LTC4360-1 features a soft shutdown controlled by theONpin, while the LTC4360-2 controls an optional external P-channel MOSFET for negative voltage protection.ApplicationsUSB ProtectionHandheld ComputersCell/Smart PhonesMP3/MP4 PlayersDigital Cameras